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我儿子的玩具车电平坏了,是6V 的电平没有现成的,电平车电平手中有个,但是是12V的.没法用.想改成6V.参照人家的电路但电路的电感我不知道怎么计算.谁会啊?教教我.另问高手一下,用7806是不是效率不高啊?500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/83/3122051258014116.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
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